console.log(module.exports === exports)


const circle = require("./08_commonjs_circle")

console.log(`圆的面积:${circle.area(4)}`)

const circle_area = require("./08_commonjs_circle").area
console.log(`圆的面积${circle_area(4)}`)

const { area } = require("./08_commonjs_circle")
console.log(`圆的面积:${area(4)}`)

const square = require("./08_commonjs_square")
console.log(`正方形的面积:${square.area(4)}`)

const { area: square_area } = require("./08_commonjs_square")
console.log(`正方形的面积:${square_area(4)}`)